Historic Earthquakes

In the Ridgedale area of the sparsely populated
Pocatello Valley, this earthquake shifted several ranch
houses on their foundations and toppled many chimneys.
At Malad City, 20 kilometers northeast of the epicenter, about
40 percent of the chimneys on old buildings were
damaged. Total property damage was estimated at $1 million.

Geologists observed one zone of ground
fractures - about 0.6 kilometers long and 5 centimeters wide - in the
south-central section of the valley. The shock
triggered many snow avalanches northeast of the valley.
Fourteen aftershocks ranging in magnitude from 3.8 to
4.7 were located through March 31. Felt in parts of
Colorado, Idaho, Nevada, Utah, and Wyoming.

Abridged from
Seismicity of the United States, 1568-1989 (Revised),
by Carl W. Stover and Jerry L. Coffman,
U.S. Geological Survey Professional Paper 1527,
United States Government Printing Office, Washington: 1993.